Then I thought about an opera singer being able to shatter a wine glass with the correct frequency. Hypothesis: Ductility: If a jack hammer hits the pipe at just the right speed that metal will bend repeatedly and break first at any preweakened or damaged points first (Loosely tightened threaded areas) and then, given more time, create more weak points starting closer to the jack and equally at the leading pointed tip.
https://www.youtube.com/watch?v=o43t4eSq5ng
Turns out my experience was not so rare after all!!
I ended up renting a small gas powered Honda 4 stroke "Pipe Pounder" from my rental store for $40.... The
sacrificial connectors are the ONLY way to go. The connectors for 1
1/4" pipe JUST fit into the sleeve on the pounder, and after two five
foot pipes they are mushroomed. Just put a new one on and then a new length of pipe.
not in clay! I did a starter hole 22 feet down - and just tried the
Rhino GPD 35 - and it mushroomed the coupler - sheared it off the 1 1/4
pipe also. So - the adapter was the largest size though - not sure - the
coupler is maybe too smaller for a 2 inch adapter? Anyway good luck and
let me know if you have any better luck. hahaha. I got about 8 inches
down before my sacrificial section of pipe was completely sheared off - I
did a blog post on it. And it was SLOW. I think when I hit a rock - it
bounced back like in this vid - and I switched over to a manual 30 lb
fence post driver - to get past that rock. It seemed to go faster after
that but maybe it was the manual post driver that sheared off the
coupler.
My initial thought was lateral movement as shear force. The rental owner said the top sacrificial pipe must have come loose since that causes them to break....But now I think - when I see how much that top coupler Mushroomed - this is stainless steel - so it doesn't mushroom easily. I didn't notice how much the coupler on top had MUSHROOMED!! Holy
smokes. I think I must have hit a rock. Because I stopped making
progress and then I switched back to the hand post pounder - 30 lbs -
and made sure I was making progress again. Then switched back to the Gas Powered Driver (GPD)
- and that's when it was making progress but then broke the sacrificial pipe...
I must have hit a rock as the initial cause of shearing off the pipe... via the couplers...
There's 12 threads total - the rental guy says probably the pipe came loose but it had 7 threads in the pipe. So
five threads left on the sheared off pipe. Which means 7 threads are in
the coupler still - not very loose! I think it was because I had too
much lateral movement - space in the adapter.
An Adapter that is too large for the post being driven may damage the driver and may damage the end of the post.
Anyway - it was still very slow but faster - and thus exciting to know that faster is possible.
Probably a half inch too wide of an adapter - but
I was pulling down on the GPD - since I was starting to make
"good time." hahahaha.
Do not allow the driver to tilt forward, back or to the side. If not
aligned properly, damage could be caused to the driver or the post.
(Fig. 5)
5.) Apply steady downward pressure to the handles and apply enough throttle to engage the clutch and hammer.
At first I got NOTHING. So I used the
30 lb hand pounder to "break through" the frozen start - I could get
more NEWTONS with slamming down my arms on the 30 lbs... but it was
faster with the Gas Power Driver....
The TOP of the pipe ALSO sheared off while FULLY in the coupler!!! Very strange to be "loose." hahaha.
So
then I told the rental dude that the remaining coupler was NOT loose -
so it's probably cross-threaded? So once I get that remaining coupler
off - then add another sacrificial section - and see if I get "faster"
progress by the hand manual post pounder....
If not then I'll try the gas powered driver again with a smaller adapter... and not pull down on it. hahahahaha
He
was happy I paid the 24 hour rate for 6 hours instead of haggling with
him. Then he said that sandpoint water tastes much better and he paid
$8000 for 160 feet drilling that gave him rusty water!! He said
Grindstone lake has an underground river to Lake Superior!
That's a beast of a lake, has smelt run. Locals swear there are
underwater rivers to superior and also that the depth couldn't be
reached in some areas. I know that's probably nothing, but I hear it
from everyone and never see people driving out in the middle. I've
swimmed it in the summer, terribly cold
I forgot to mention I checked in the other pipe (2 inches down 23 feet)
to see if I had water in the winter and YES!!! There was water!! So
that's very exciting. Of course as drought gets worse - the water table
will drop.... and the water is still in clay so the recharge rate is
slow. I don't need that much water though. I just need to devise a
"tube" Amish water bucket that has a spring latch that closes after it
fills with water. They used to sell them... but they were not available -
also I think it's 3 inches diameter or something - so I need to make my
own... for 2 inch pipe and 1 1/4" pipe (until I get my manual hand pump
down - I could just CUT the hex tube to less feet - hex tube like that
is super cheap....
Fits wells down to 4"ID
Maybe a Jackhammer is better than a GPD?
torque of 3.5 N.m for providing powerful impact force at 7000 rph (so VERY SLOW!!) just 116 rpm
Driving 1.25 galvanized pipe will take forever depending on soil
conditions. We have clay on sand and there was little progress. Post
pounder will drive about an inch a hit, this unit will maybe give you an
1/4 of an inch after a minute or so.
https://www.amazon.com/Yescom-Powered-Portable-Gasoline-Certificated/dp/B07K468B5N?th=1
That's a BIGGER engine than what I was using... so...
It
might drive t-bar but with a 25:1 fuel oil ratio, it blows so much blue
smoke that you'll feel bad and be embarrassed using it.
The engine I used today had
1.2 lb-ft (1.6 Nm) @ 5,500 rpm
At higher RPM you get more power.
The faster the RPMs, the faster the piston and connecting rod are
whipped back and forth, and greater the force due to acceleration on the
piston and connecting rod. In particular, at high RPMs, force due acceleration of the
connecting rod as applied to the crankshaft bearings, may be quite a bit
greater than forces of the hot gases on the piston. This is why the
mass of the counterweights on the crankshaft need to be tuned for the
likely RPM range of the engine
I think 1 1/2 PVC well bucket is pushing it too because the outer dimensions of those are 1.9". ...I think I'm going with a 1 1/4 inch pipe because that has an OD of 1.66" and I'll have to fashion a check value configuration that does not stick outside of the 1.66 inches,
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